package com.token.filter;

import com.token.domain.LoginUser;
import com.token.utils.JwtUtil;
import com.token.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;


    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

        //获取token

        String token = request.getHeader("token");

        if (!StringUtils.hasText(token)) {

            //放行
            filterChain.doFilter(request, response);

            return;
        }

        //解析token

        String userId;
        try {
            Claims claims = JwtUtil.parseJWT(token);

            userId = claims.getSubject();


        } catch (Exception e) {
            throw new RuntimeException(e);
        }


        //从redis中获取用户信息


        String redisKey = "login:" + userId;

        LoginUser loginUser = redisCache.getCacheObject(redisKey);

        //存入SecurityContextHolder


        if (Objects.isNull(loginUser)){
            throw new RuntimeException("用户未登录");
        }
        //存入SecurityContextHolder
        //TODO 获取权限信息封装到Authentication中

        UsernamePasswordAuthenticationToken usernamePassword=new UsernamePasswordAuthenticationToken(loginUser,null,null);

        SecurityContextHolder.getContext().setAuthentication(usernamePassword);


        filterChain.doFilter(request,response);


    }
}
